21224355024641 has 2 divisors, whose sum is σ = 21224355024642. Its totient is φ = 21224355024640.

The previous prime is 21224355024599. The next prime is 21224355024661. The reversal of 21224355024641 is 14642055342212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16768034024641 + 4456321000000 = 4094879^2 + 2111000^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224355024641 - 2²⁶ = 21224287915777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21224355024661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612177512320 + 10612177512321.

It is an arithmetic number, because the mean of its divisors is an integer number (10612177512321).

Almost surely, 2^{21224355024641} is an apocalyptic number.

It is an amenable number.

21224355024641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224355024641 is an equidigital number, since it uses as much as digits as its factorization.

21224355024641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 21224355024641 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred fifty-five million, twenty-four thousand, six hundred forty-one".